A Comparative Study between Via-Hole and Via-Free Grounded Coplanar Waveguide to Microstrip Transitions on Thin Polymer Substrate

Figure 4

-parameters of the back-to-back transitions without and with one optimized via-hole ( = 300 μm located 500 μm from both axes I and II; cf. Figure 3) and with five via-holes of different diameters (50 μm, 75 μm, and 100 μm) spaced by 250 μm along - and - directions (cf. Figure 3). (a) Transmission coefficient (dB) and (b) reflection coefficient (dB).

(a)

(b)